I did a but I can't for b c d

A satellite of mass 59.0 Kg is being pulled out of orbit by 450.0?
1- A satellite of mass 59.0 Kg is being pulled out of orbit by 450.0 Netwons of gravity. Small thrusters are used to maneuver the satellite back to its orbite.
a)What thrust would cause the satellite to move with a constant velocity?

Find the accerleration of the satellite in response to the following thrusts:
b) 205 N up c) 205 N down d) 205 N right.

I found the a that is 450 N. However, I do not for b-c-d could someone help me please

b) 205-450= 59 a a=-4.9 m/s^2 the acceleration down.
c) -205-450=59 a a=-13.1 m/s^2 a goes down
d)205-450=59 a=-4.2m/s^2 a goes down too